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Library preparations

library(readr)
library(dplyr)
library(tidyverse)
library(ggplot2)
library(reshape2)
library(stats)
library(tm)
library(text2vec)
library(textstem)

Data Import

data_posts <- read.csv("~/4year/2semester/dtII/CSVs/HEIs.csv",
                 colClasses = c(tweet_id = "character"))

# Modifying created_at type so that attribute can be used more easily 
data_posts$created_at <- as.POSIXct(data_posts$created_at,
                              format= "%Y-%m-%dT%H:%M:%S", tz="UTC")

#View(data)
summary(data_posts)
      id              tweet_id             text               type           bookmark_count    favorite_count     retweet_count      reply_count      
 Length:11728       Length:11728       Length:11728       Length:11728       Min.   :  0.000   Min.   :    0.00   Min.   :   0.00   Min.   :   0.000  
 Class :character   Class :character   Class :character   Class :character   1st Qu.:  0.000   1st Qu.:    7.00   1st Qu.:   2.00   1st Qu.:   0.000  
 Mode  :character   Mode  :character   Mode  :character   Mode  :character   Median :  0.000   Median :   20.00   Median :   5.00   Median :   1.000  
                                                                             Mean   :  1.543   Mean   :   60.67   Mean   :  10.62   Mean   :   3.888  
                                                                             3rd Qu.:  1.000   3rd Qu.:   57.00   3rd Qu.:  11.00   3rd Qu.:   3.000  
                                                                             Max.   :418.000   Max.   :41655.00   Max.   :4214.00   Max.   :2317.000  
                                                                                                                                                      
   view_count        created_at                       hashtags             urls            media_type         media_urls       
 Min.   :      5   Min.   :2022-08-01 03:05:11.00   Length:11728       Length:11728       Length:11728       Length:11728      
 1st Qu.:   2643   1st Qu.:2022-10-19 12:56:27.00   Class :character   Class :character   Class :character   Class :character  
 Median :   6240   Median :2023-01-29 08:26:30.00   Mode  :character   Mode  :character   Mode  :character   Mode  :character  
 Mean   :  14182   Mean   :2023-01-30 07:39:34.96                                                                              
 3rd Qu.:  16058   3rd Qu.:2023-05-05 14:16:43.25                                                                              
 Max.   :7604544   Max.   :2023-08-31 20:50:01.00                                                                              
 NA's   :4840                                                                                                                  

Initial Data Preparation

# Count of how many entries each HEI has
number_posts <- data_posts %>%
              group_by(id) %>% summarise(count = n())

number_posts

Since complutense only has 1 entry we can’t learn anything from it, so we removed it

data_posts <- data_posts[data_posts$id != "complutense.csv", ]

Visualization of all posts, just tweets and just replies

number_posts <- data_posts %>%
              group_by(id) %>% summarise(posts = n())

number_tweets <- data_posts[data_posts$type == "Tweet", ] %>%
              group_by(id) %>% summarise(tweets = n())

number_replies <- data_posts[data_posts$type == "Reply", ] %>%
              group_by(id) %>% summarise(replies = n())

print(number_posts)
print(number_tweets)
print(number_replies)

Calculating the percentage of tweets and replies based on all posts

# Merging the counts of tweets and replies with the count of posts
data_ratio <- merge(number_posts, number_tweets, by = "id", all = TRUE)
data_ratio <- merge(data_ratio, number_replies, by = "id", all = TRUE)


data_ratio$percentage_tweets <- round(((data_ratio$tweets / data_ratio$posts) * 100), 2)
data_ratio$percentage_replies <- round(((data_ratio$replies / data_ratio$posts) * 100), 2)

data_ratio <- data_ratio[, c("id", "percentage_tweets", "percentage_replies")]

data_ratio$percentage_replies[is.na(data_ratio$percentage_replies)] <- 0

print(data_ratio)

NA removal

Function to visualize the number of NAs in all columns

na_count <- function(){
  # Counting the number of NA values for each column
  na_count <- colSums(is.na(data_posts))
  
  # Creating a new data frame with the NA counts
  na_counts_table <- data.frame(Column = names(na_count), NA_Count = na_count)
  
  print(na_counts_table)
}

Calculations of view, favourite, retweet and reply percentiles and visualization of NAs in all columns

data_posts <- data_posts %>%
  group_by(id) %>%
  mutate(view_percentile = ntile(view_count, 100),
         favorite_percentile = ntile(favorite_count, 100),
         retweet_percentile = ntile(retweet_count, 100),
         reply_percentile = ntile(reply_count, 100)) %>%
  rowwise() %>%
  mutate(avg_percentile = round(mean(c(view_percentile, favorite_percentile, retweet_percentile, reply_percentile), na.rm = TRUE), 2))

na_count()

data_percentile <- data_posts[, c("id", "view_percentile", "favorite_percentile", "retweet_percentile", "reply_percentile", "avg_percentile")]

print(data_percentile)

Calculation of the maximum number of views for each HEI

max_view_counts <- tapply(data_posts$view_count, data_posts$id, max, na.rm = TRUE)

print(max_view_counts)
      duke.csv       epfl.csv        goe.csv    harvard.csv  leicester.csv manchester.csv        mit.csv         sb.csv   stanford.csv    trinity.csv 
        307969         105095          15455        2982704          47838         317086        7604544         607498         222593         205333 
        wv.csv       yale.csv 
        109265         143108 

Removal of NAs

# From view count
data_posts$view_count <- ifelse(
  is.na(data_posts$view_count),
  round(max_view_counts[data_posts$id] * (data_posts$avg_percentile / 100)),
  data_posts$view_count)

# From view percentile
data_posts$view_percentile <- ifelse(
  is.na(data_posts$view_percentile),
  data_posts$avg_percentile,
  data_posts$view_percentile)

Visualization of NAs in all columns

na_count()

Function to calculate average posts

average_posts <- function(timeframe){
  # Calculation of the timeframe between earliest and latest post for each HEI
  date_range <- data_posts %>%
    group_by(id) %>%
    summarise(min_date = min(created_at),
              max_date = max(created_at)) %>%
    mutate(num_days = as.numeric(difftime(max_date, min_date, units = timeframe)))
  
  # Naming the column respecting the timeframe
  column_name <- paste0("avg_posts_per_", timeframe)
  
  # Calculation of the number of posts per day for each HEI
  posts_per_timeframe <- number_posts %>%
    left_join(date_range, by = "id") %>%
    mutate(!!column_name := round((posts / num_days), 2))
  
  print(posts_per_timeframe)
  return(posts_per_timeframe)
}
posts_per_day <- average_posts("days")
posts_per_week <- average_posts("weeks")

Plot for the average number of posts per day for each HEI

barplot(posts_per_day$avg_posts_per_days,
        names.arg = posts_per_day$id,
        main = "Average Posts per Day",
        xlab = "HEI",
        ylab = "Average Number of Posts",
        ylim = c(0, max(posts_per_day$avg_posts_per_days) + 1),
        las = 2,
        col = "#3498DB")

# Adding text labels over each bar and aligning it with the center of each bar 
text(x = barplot(posts_per_day$avg_posts_per_days, plot = FALSE),
     y = posts_per_day$avg_posts_per_days,
     labels = round(posts_per_day$avg_posts_per_days, 2),
     pos = 3)

Plot for the average number of posts per week for each HEI

barplot(posts_per_week$avg_posts_per_weeks,
        names.arg = posts_per_week$id,
        main = "Average Posts per Week",
        xlab = "HEI",
        ylab = "Average Number of Posts",
        ylim = c(0, max(posts_per_week$avg_posts_per_weeks) + 5),
        las = 2,
        col = "#E74C3C")

text(x = barplot(posts_per_week$avg_posts_per_weeks, plot = FALSE),
     y = posts_per_week$avg_posts_per_weeks,
     labels = round(posts_per_week$avg_posts_per_weeks, 2),
     pos = 3)

Defining the intervals of time for the academic year

intervals <- list(
  interval1 = as.POSIXct(c("2022-08-31", "2022-12-15")),
  interval2 = as.POSIXct(c("2023-01-04", "2023-04-01")),
  interval3 = as.POSIXct(c("2023-04-14", "2023-06-15"))
)

Function to check if a date falls within a given interval of time and apply appropriate Boolean

check_interval <- function(date) {
  for (i in 1:length(intervals)) {
    interval_start <- intervals[[i]][1]
    interval_end <- intervals[[i]][2]
    if (date >= interval_start & date <= interval_end) {
      return(TRUE)
    }
  }
  return(FALSE)
}
data_posts$academic_year <- sapply(data_posts$created_at, check_interval)
print(data.frame(id = data_posts$id, academic_year = data_posts$academic_year))

Function to count number of posts and average per day during academic time and vacation time

analyze_posts <- function(academic_year_filter) {
  # Filtering the data based on the academic_year_filter
  filtered_data <- data_posts %>%
    filter(academic_year == academic_year_filter)
  
  # Count of days for each HEI
  unique_days <- filtered_data %>%
    group_by(id) %>%
    summarise(unique_days = n_distinct(as.Date(created_at)))
  
  # Count of posts for each HEI
  number_posts_boolean <- filtered_data %>%
    group_by(id) %>%
    summarise(count = n())
  
  # Naming the column respecting the time period
  time <- ifelse(academic_year_filter, "academic_time", "vacation_time")
  column_name <- paste0("avg_posts_in_", time)
  
  # Combination of data and calculation of average posts per day
  combined_data <- left_join(unique_days, number_posts_boolean, by = "id")
  combined_data <- combined_data %>%
    mutate(!!column_name := round((count / unique_days), 2))
  
  print(combined_data)
  return(combined_data)
}
data_posts_academic <- analyze_posts(TRUE)
data_posts_vacations <- analyze_posts(FALSE)

Plot for the average number of posts during academic time for each HEI

barplot(data_posts_academic$avg_posts_in_academic_time,
        names.arg = data_posts_academic$id,
        main = "Average Posts during Academic Time",
        xlab = "HEI",
        ylab = "Average Number of Posts",
        ylim = c(0, max(data_posts_academic$avg_posts_in_academic_time) + 5),
        las = 2,
        col = "#34495E")

text(x = barplot(data_posts_academic$avg_posts_in_academic_time, plot = FALSE),
     y = data_posts_academic$avg_posts_in_academic_time,
     labels = round(data_posts_academic$avg_posts_in_academic_time, 2),
     pos = 3)

Plot for the average number of posts during vacation time for each HEI

barplot(data_posts_vacations$avg_posts_in_vacation_time,
        names.arg = data_posts_vacations$id,
        main = "Average Posts during Vacation Time",
        xlab = "HEI",
        ylab = "Average Number of Posts",
        ylim = c(0, max(data_posts_vacations$avg_posts_in_vacation_time) + 5),
        las = 2,
        col = "#D35400")

text(x = barplot(data_posts_vacations$avg_posts_in_vacation_time, plot = FALSE),
     y = data_posts_vacations$avg_posts_in_vacation_time,
     labels = round(data_posts_vacations$avg_posts_in_vacation_time, 2),
     pos = 3)

Data preparation for dates

# Creating new table that contains a new column for the day of the week
data_posts_days <- data_posts %>%
  mutate(day_of_week = weekdays(created_at))

# Selecting only the id, created_at, and day_of_week columns for the new table
data_posts_days <- data_posts_days %>%
  select(id, created_at, day_of_week)

# Create column hour from created_at
data_posts_days$created_hour <- as.numeric(format(data_posts_days$created_at, "%H"))

print(data_posts_days)
# Grouping by id and day_of_week, then counting the number of posts
number_posts_days <- data_posts_days %>%
  group_by(id, day_of_week) %>%
  summarise(count = n())
`summarise()` has grouped output by 'id'. You can override using the `.groups` argument.
# Grouping by id, day_of_week and day created at, then counting th enumber of tweets
number_posts_per_day <- data_posts_days %>%
    mutate(created_date = as.Date(created_at)) %>% 
    group_by(id, day_of_week, created_date) %>%
    summarize(count = n())
`summarise()` has grouped output by 'id', 'day_of_week'. You can override using the `.groups` argument.
# Finding for each HEI the average count of posts per day
average_number_posts_per_day <- number_posts_per_day %>%
  group_by(id, day_of_week) %>%
  summarise(average_count = round(mean(count), 2))
`summarise()` has grouped output by 'id'. You can override using the `.groups` argument.
print(number_posts_days)

Highest and lowest posts

# Finding the HEI with the lowest count of posts per day
lowest_count <- number_posts_days %>%
  group_by(day_of_week) %>%
  slice_min(order_by = count) %>%
  select(day_of_week, id, count)

# Finding the HEI with the highest count of posts per day
highest_count <- number_posts_days %>%
  group_by(day_of_week) %>%
  slice_max(order_by = count) %>%
  select(day_of_week, id, count)

# Combine the results
high_low_HEI <- bind_rows(lowest_count, highest_count) %>%
  arrange(day_of_week)

print(high_low_HEI)

Plot for the highest and lowest count of posts per day for each day of the week

ggplot(high_low_HEI, aes(x = day_of_week, y = count, fill = id)) +
  geom_bar(stat = "identity", position = "dodge") +
  geom_text(aes(label = count),
            position = position_dodge(width = 0.9),
            vjust = -0.5,
            size = 3) +
  labs(title = "Highest and Lowest Count of Posts per Day for Each Day of the Week",
       x = "Day of the Week", y = "Count") +
  scale_fill_manual(values = rainbow(length(unique(high_low_HEI$id)))) +
  theme_minimal() +
  theme(legend.title = element_blank())

Average of posts

# Finding the HEI with lowest and highest averaged count of posts per day
high_low_average_HEIs <- average_number_posts_per_day %>%
  group_by(day_of_week) %>%
  filter(average_count == max(average_count) | average_count == min(average_count)) %>%
  arrange(day_of_week, ifelse(average_count == min(average_count), average_count, -average_count))

print(high_low_average_HEIs)

Plot for the highest and lowest average count of posts per day for each day of the week

ggplot(high_low_average_HEIs, aes(x = day_of_week, y = average_count, fill = id)) +
  geom_bar(stat = "identity", position = "dodge") +
  geom_text(aes(label = round(average_count, 2)),
            position = position_dodge(width = 0.7),
            vjust = -0.5,
            size = 3) +
  labs(title = "Highest and Lowest Average Count of Posts per Day for Each Day of the Week",
       x = "Day of the Week", y = "Average Count") +
  scale_fill_manual(values = rainbow(length(unique(high_low_HEI$id)))) +
  theme_minimal() +
  theme(legend.title = element_blank())

Favourite hour and day

favourite_day_hei <- number_posts_days %>%
  group_by(id) %>%
  top_n(1, count) %>%
  arrange(id)

print(favourite_day_hei)
number_posts_hours <- data_posts_days %>%
  group_by(id, created_hour) %>%
  summarise(count = n()) %>%
  ungroup()
`summarise()` has grouped output by 'id'. You can override using the `.groups` argument.
favourite_hour_hei <- number_posts_hours %>%
  group_by(id) %>%
  top_n(1, count) %>%
  arrange(id)

print(favourite_hour_hei)

Heatmaps

Function to plot heatmap for various HEIs

heatmap_maker <- function(target_id){
  # Filtering data for the specific HEI
  target_data <- data_posts_days %>%
    filter(id == target_id)
  
  # Grouping by day of the week and hour, and counting the number of tweets
  tweet_counts <- target_data %>%
    group_by(day_of_week, created_hour) %>%
    summarise(num_posts = n())
  
  # Plotting heatmap
  ggplot(tweet_counts, aes(x = day_of_week, y = created_hour, fill = num_posts)) +
    geom_tile() +
    scale_fill_gradient(low = "white", high = "blue") +
    labs(title = paste("Post Heatmap for", target_id),
         x = "Day of the week",
         y = "Hour of the day")
}

Plot of heatmap for each HEI

heatmap_maker("duke.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("epfl.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("goe.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("harvard.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("leicester.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("manchester.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("mit.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("sb.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("stanford.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("trinity.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("wv.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

heatmap_maker("yale.csv")
`summarise()` has grouped output by 'day_of_week'. You can override using the `.groups` argument.

Hashtags

# Transforming empty strings into NA
data_posts$hashtags[data_posts$hashtags == ""] <- NA

# Table with number of unique hashtags and percentage of usage
hashtags <- data_posts %>%
                group_by(id) %>%
                summarise(count = n(),
                          na = sum(is.na(hashtags)),
                          unique_hashtags = length(unique(hashtags)),
                          hashtag_percentage = round(((count - na) / count * 100), 2))

print(hashtags)

Plot for the count of unique hashtags for each HEI

barplot(hashtags$unique_hashtags,
        names.arg = hashtags$id,
        main = "Unique Hashtags for Each HEI",
        xlab = "HEI",
        ylab = "Count of Unique Hashtags",
        ylim = c(0, max(hashtags$unique_hashtags) + 50),
        las = 2,
        col= "#16A085")

text(x = barplot(hashtags$unique_hashtags, plot = FALSE),
     y = hashtags$unique_hashtags,
     labels = round(hashtags$unique_hashtags, 2),
     pos = 3)

Plot for the usage of hashtag for each HEI

barplot(hashtags$hashtag_percentage,
        names.arg = hashtags$id,
        main = "Hashtags Percentage for Each HEI",
        xlab = "HEI",
        ylab = "Hashtags Percentage",
        ylim = c(0, max(hashtags$hashtag_percentage) + 30),
        las = 2,
        col= "#F1C40F")

text(x = barplot(hashtags$hashtag_percentage, plot = FALSE),
     y = hashtags$hashtag_percentage,
     labels = round(hashtags$hashtag_percentage, 2),
     pos = 3)

URL usage

# Transforming empty strings into NA
data_posts$urls[data_posts$urls == ""] <- NA

# Table with number of post, number of NA and url percentage of usage
url_usage <- data_posts %>%
                group_by(id) %>%
                summarise(count = n(),
                          na = sum(is.na(urls)),
                          url_percentage = round(((count - na) / count * 100), 2))

print(url_usage)

Plot for the usage of hashtag for each HEI

barplot(url_usage$url_percentage,
        names.arg = url_usage$id,
        main = "Urls Percentage for Each HEI",
        xlab = "HEI",
        ylab = "Urls Percentage",
        ylim = c(0, max(url_usage$url_percentage) + 10),
        las = 2,
        col= "#8E44AD")

text(x = barplot(url_usage$url_percentage, plot = FALSE),
     y = url_usage$url_percentage,
     labels = round(url_usage$url_percentage, 2),
     pos = 3)

Text

data_posts_content <- data_posts %>%
            select(id, text)

# Counting number of words
data_posts_content <- data_posts_content %>%
  mutate(num_words = lengths(strsplit(text, "\\s+")))

# Grouping by HEI and calculate average, minimum, and maximum values of number of words
data_posts_content_metrics <- data_posts_content %>%
  group_by(id) %>%
  summarise(average_num_words = mean(num_words),
            min_num_words = min(num_words),
            max_num_words = max(num_words))
print(data_posts_content_metrics)

Plot for the average, maximum and minimum values of words for each HEI

ggplot(data_posts_content_metrics, aes(x = id, y = average_num_words)) +
  geom_point(aes(color = "Average")) +
  geom_errorbar(aes(ymin = min_num_words, ymax = max_num_words, color = "Range"), width = 0.2) +
  scale_color_manual(values = c("Average" = "#1976D2", "Range" = "#EF5350")) +
  labs(title = "Word Count Summary by HEI",
       x = "HEI",
       y = "Number of Words",
       color = "Metric") +
  theme_minimal() +
  theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust = 1))

Clusters

# Creating table for cluster algorithms

# Joining attribute percentage_tweets (percentage of tweets out of all posts) and percentage_replies (percentage of replies out of all posts) from number_posts also adding unique_hashtags (number of unique hashtags) and hashtag_percentage (percentage of posts that contain a hashtag) from hashtags, per HEI
cluster_table <- merge(select(hashtags, id, unique_hashtags, hashtag_percentage), select(data_ratio, id, percentage_tweets, percentage_replies), by = "id", all=TRUE)

# Joining attribute avg_posts_per_days (average of posts per day) from posts_per_day per HEI
cluster_table <- merge(cluster_table, select(posts_per_day, id, avg_posts_per_days), by = "id", all=TRUE)

# Joining attribute avg_posts_per_weeks (average of posts per week) from posts_per_week per HEI
cluster_table <- merge(cluster_table, select(posts_per_week, id, avg_posts_per_weeks), by = "id", all=TRUE)

# Joining attribute avg_posts_in_academic_time (average of posts during academic time)  from data_posts_academic per HEI
cluster_table <- merge(cluster_table, select(data_posts_academic, id, avg_posts_in_academic_time), by = "id", all=TRUE)

# Joining attribute avg_posts_in_vacation_time (average of posts during vacation time) from data_posts_vacations per HEI
cluster_table <- merge(cluster_table, select(data_posts_vacations, id, avg_posts_in_vacation_time), by = "id", all=TRUE)

# Joining attribute created_hour (hour where every HEI made more posts) from favourite_hour_hei per HEI
cluster_table <- merge(cluster_table, select(favourite_hour_hei, id, created_hour), by = "id", all=TRUE)

# Joining attribute url_percentage (percentage of posts that contain an url) from url_usage per HEI
cluster_table <- merge(cluster_table, select(url_usage, id, url_percentage), by = "id", all=TRUE)

# Joining attribute average_num_words (average number of words in the posts) from data_posts_content_metrics per HEI
cluster_table <- merge(cluster_table, select(data_posts_content_metrics, id, average_num_words), by = "id", all=TRUE)

print(cluster_table)

Function for cluster method

cluster_maker <- function(num_clusters, table){
  # Excluding id column for clustering
  cluster_data <- select(table, -id)
    
  # Scaling the data for kmeans method
  scaled_data <- scale(cluster_data)
  
  kmeans_model <- kmeans(scaled_data, centers = num_clusters, nstart = 10)

  # Extract cluster assignments
  cluster_assignments <- kmeans_model$cluster
  
  # Create a data frame combining original data with cluster assignments
  clustered_data <- cbind(cluster_table$id, cluster_data, cluster = cluster_assignments)
  
  clustered_data <- clustered_data[, c("cluster_table$id", "cluster")]
  
  print(clustered_data)
}

Function to discover best number of clusters

elbow_maker <- function(table){
  cluster_data <- select(table, -id)
  scaled_data <- scale(cluster_data)
  
  wss <- vector()
  range <- 1:10
  
  for (k in range) {
    kmeans_model <- kmeans(scaled_data, centers = k, nstart = 10)
    wss[k] <- kmeans_model$tot.withinss
  }
  
  elbow_df <- data.frame(k = range, WSS = wss)
  ggplot(elbow_df, aes(x = k, y = WSS)) +
    geom_line() +
    geom_point() +
    labs(x = "Number of Clusters", y = "Within-Cluster Sum of Squares (WCSS)",
         title = "Elbow Method for Optimal k") +
    theme_minimal()
}

elbow_maker(cluster_table)

cluster_maker(3, cluster_table)

2 Parte

cleanup <- function(docs, spec.words=NULL){
  # lowercase
  docs <- tm_map(docs, content_transformer(tolower))
  # rm numbers
  docs <- tm_map(docs, removeNumbers)
  # rm english common stopWords
  docs <- tm_map(docs, removeWords, stopwords("english"))
  # if stopwords are specified as a character vector
  if(!is.null(spec.words))
    docs <- tm_map(docs, removeWords, spec.words)
  # rm punctuations
  docs <- tm_map(docs, removePunctuation)
  # rm extra white spaces
  docs <- tm_map(docs, stripWhitespace)
  # lemmatizing text
  docs <- tm_map(docs, lemmatize_words)
  
  docs
}
pairing <- function(word_dict, paired_words) {
  if (nrow(word_dict) != length(paired_words)) {
    stop("The number of rows in word_dict and the length of paired_words should be equal.")
  }
  
  word_dict <- tibble::tibble(word = word_dict$value)
  result <- tibble::tibble(word = word_dict$word, category = paired_words)
  return(result)
}
classify_text <- function(text, word_pair) {
  # Tokenizing the text and converting to lowercase
  words <- tolower(unlist(strsplit(text, "\\W+")))
  
  # Finding the frequent words in the text
  freq_words <- words[words %in% word_pair$word]
  
  if (length(freq_words) == 0) {
    return("Unknown")  # Returning Unknown if no frequent words are found
  }
  
  # Getting the corresponding categories
  categories <- word_pair$category[word_pair$word %in% freq_words]
  
  # Sorting categories by frequency in descending order and return the most frequent one
  return(names(sort(table(categories), decreasing = TRUE))[1])
}
corpus_maker <- function(text) {
  texts <- text$text
  vc <- VectorSource(texts)
  corpus <- Corpus(vc)
  
  return(corpus)
}
freq_terms <- function(clean_text, number) {
  dtm <- DocumentTermMatrix(clean_text)
  dtm.tfidf <- weightTfIdf(dtm)
  
  mdf <- as_tibble(as.matrix(dtm.tfidf))
  
  mdf.freq <- mdf %>%
  select(findFreqTerms(dtm, number)) %>%
  summarise_all(sum) %>%
  gather() %>%
  arrange(desc(value))

  mdf.freq$key <- 
    factor(mdf.freq$key,
           levels = mdf.freq$key[order(mdf.freq$value)])
  
  word_dictionary <- as_tibble(mdf.freq$key)
  
  ggplot(mdf.freq, aes(x=key, y=value)) +
    geom_bar(stat="identity") +
    labs(x="terms", y="freq") + coord_flip()
  
  return(word_dictionary)
}

Duke analysis

duke_text <- subset(data_posts_content, id == "duke.csv")
duke_corpus <- corpus_maker(duke_text)

duke_clean_text <-cleanup(duke_corpus, c("new", "will", "change", "north", "can", "first", "year", "carolina", "years", "summer", "meet", "one"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
duke_word_dictionary <- freq_terms(duke_clean_text, 30)

duke_word_category <- c("Image", "Education", "Education", "Image", "Image", "Research", "Research", "Image", "Image", "Engagement", "Research", "Research", "Image", "Education", "Education", "Society", "Education", "Engagement")

duke_word_pair <- pairing(duke_word_dictionary, duke_word_category)

print(duke_word_pair)

# Applying the classify_text function to each text
duke_text <- duke_text %>%
  mutate(category = sapply(text, classify_text, word_pair = duke_word_pair))

print(duke_text)

epfl

epfl_text <- subset(data_posts_content, id == "epfl.csv")
epfl_corpus <- corpus_maker(epfl_text)

epfl_clean_text <- cleanup(epfl_corpus, c("new", "amp", "can", "will", "one", "now", "–", "via", "portrait"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
epfl_word_dictionary <- freq_terms(epfl_clean_text, 30)

epfl_word_category <- c("Image", "Research", "Image", "Research", "Research", "Research", "Education", "Image", "Research", "Research", "Education", "Research", NA, "Education", "Education")

epfl_word_pair <- pairing(epfl_word_dictionary, epfl_word_category)

print(epfl_word_pair)

# Applying the classify_text function to each text
epfl_text <- epfl_text %>%
  mutate(category = sapply(text, classify_text, word_pair = epfl_word_pair))

print(epfl_text)

goe

goe_text <- subset(data_posts_content, id == "goe.csv")
goe_corpus <- corpus_maker(goe_text)

goe_clean_text <- cleanup(goe_corpus, c("can", "new", "amp", "will"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
goe_word_dictionary <- freq_terms(goe_clean_text, 15)

goe_word_category <- c("Research", "Research", "Image", "Education", "Engagement", "Image", "Engagement", "Education")

goe_word_pair <- pairing(goe_word_dictionary, goe_word_category)

print(goe_word_pair)

# Applying the classify_text function to each text
goe_text <- goe_text %>%
  mutate(category = sapply(text, classify_text, word_pair = goe_word_pair))

print(goe_text)

harvard

harvard_text <- subset(data_posts_content, id == "harvard.csv")
harvard_corpus <- corpus_maker(harvard_text)

harvard_clean_text <- cleanup(harvard_corpus, c("new", "can", "will", "summer", "year", "first", "may", "-", "recent", "years", "one", "said", "time", "many", "world", "change"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
harvard_word_dictionary <- freq_terms(harvard_clean_text, 50)

harvard_word_category <- c("Image", "Education", "Research", "Image", "Research", "Research", "Engagement", "Education", "Society", "Education", "Society", "Research", "Education", "Image", "Research", NA, "Research", "Education", "Education", NA, "Research", "Society", "Society", "Research", "Education")

harvard_word_pair <- pairing(harvard_word_dictionary, harvard_word_category)

print(harvard_word_pair)

harvard_text <- harvard_text %>%
  mutate(category = sapply(text, classify_text, word_pair = harvard_word_pair))

print(harvard_text)

leicester

leicester_text <- subset(data_posts_content, id == "leicester.csv")
leicester_corpus <- corpus_maker(leicester_text)

leicester_clean_text <- cleanup(leicester_corpus, c("👉", "day", "new", "clear", "year", "can", "will", "time", "space", "one", "first"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
leicester_word_dictionary <- freq_terms(leicester_clean_text, 60)

leicester_word_category <- c("Image", NA, "Image", "Engagement", "Society", "Education", "Education", "Research", "Engagement", "Engagement", "Image", "Engagement", "Education", "Engamement", "Engagement", "Education", "Image", "Engagement", "Education", NA, "Image")

leicester_word_pair <- pairing(leicester_word_dictionary, leicester_word_category)

print(leicester_word_pair)

leicester_text <- leicester_text %>%
  mutate(category = sapply(text, classify_text, word_pair = leicester_word_pair))

print(leicester_text)

manchester

manchester_text <- subset(data_posts_content, id == "manchester.csv")
manchester_corpus <- corpus_maker(manchester_text)

manchester_clean_text <- cleanup(manchester_corpus, c("👇", "can", "just", "will", "get", "well", "one", "help", "now", "new", "read", "congratulations"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
manchester_word_dictionary <- freq_terms(manchester_clean_text, 50)

manchester_word_category <- c(NA, "Image", "Engagement", "Image", "Education", "Education", "Engagement", "Image", "Education", "Society", "Research", "Research", "Education", "Education", "Education", "Engagement", "Research", "Education", "Research")

manchester_word_pair <- pairing(manchester_word_dictionary, manchester_word_category)

print(manchester_word_pair)

manchester_text <- manchester_text %>%
  mutate(category = sapply(text, classify_text, word_pair = manchester_word_pair))

print(manchester_text)

mit

mit_text <- subset(data_posts_content, id == "mit.csv")
mit_corpus <- corpus_maker(mit_text)

mit_clean_text <- cleanup(mit_corpus, c("new", "can", "says", "“", "’", "—", "", "may", "first", "will", "using", "way", "one", "science"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
mit_word_dictionary <- freq_terms(mit_clean_text, 40)

mit_word_category <- c("Image", "Research", NA, "Image", NA, "Education", "Research", NA, "Education", "Research", "Research", "Education", "Research", "Research", "Image", "Education", "Education", "Research", "Research", "Research", "Research", "Research", "Research", "Research", "Research", "Society")

mit_word_pair <- pairing(mit_word_dictionary, mit_word_category)

print(mit_word_pair)

mit_text <- mit_text %>%
  mutate(category = sapply(text, classify_text, word_pair = mit_word_pair))

print(mit_text)

sb

sb_text <- subset(data_posts_content, id == "sb.csv")
sb_corpus <- corpus_maker(sb_text)

sb_clean_text <- cleanup(sb_corpus, c("new", "—", "will", "week", "can", "amp", "via", "now", "future", "first"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
sb_word_dictionary <- freq_terms(sb_clean_text, 30)

sb_word_category <- c("Image", "Research", "Image", "Image", "Image", NA, "Research", "Image", "Image", "Research", "Education", "Image", "Education", "Image", "Education", "Image", "Society")

sb_word_pair <- pairing(sb_word_dictionary, sb_word_category)

print(sb_word_pair)

sb_text <- sb_text %>%
  mutate(category = sapply(text, classify_text, word_pair = sb_word_pair))

print(sb_text)

stanford

stanford_text <- subset(data_posts_content, id == "stanford.csv")
stanford_corpus <- corpus_maker(stanford_text)

stanford_clean_text <- cleanup(stanford_corpus, c("new", "will"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
stanford_word_dictionary <- freq_terms(stanford_clean_text, 25)

stanford_word_category <- c("Image", "Image", "Research", "Education", NA)

stanford_word_pair <- pairing(stanford_word_dictionary, stanford_word_category)

print(stanford_word_pair)

stanford_text <- stanford_text %>%
  mutate(category = sapply(text, classify_text, word_pair = stanford_word_pair))

print(stanford_text)

trinity

trinity_text <- subset(data_posts_content, id == "trinity.csv")
trinity_corpus <- corpus_maker(trinity_text)

trinity_clean_text <- cleanup(trinity_corpus, c("amp", "read", "new", "can", "will", "week", "work", "great", "day", "visit", "irish", "first", "led", "congratulations"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
trinity_word_dictionary <- freq_terms(trinity_clean_text, 40)
Warning: empty document(s): 754
trinity_word_category <- c("Image", "Education", "Research", "Image", "Research", "Image", "Research", "Society", "Society", "Education", "Engagement", "Engagement", "Education", "Image", "Education", "Image", "Research")

trinity_word_pair <- pairing(trinity_word_dictionary, trinity_word_category)

print(trinity_word_pair)

trinity_text <- trinity_text %>%
  mutate(category = sapply(text, classify_text, word_pair = trinity_word_pair))

print(trinity_text)

wv

wv_text <- subset(data_posts_content, id == "wv.csv")
wv_corpus <- corpus_maker(wv_text)

wv_clean_text <- cleanup(wv_corpus, c("💛💙", "🙌", "👉", "happy", "day", "see", "week", "great", "can", "will", "well", "know", "new", "now", "get", "just"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
wv_word_dictionary <- freq_terms(wv_clean_text, 40)

wv_word_category <- c(NA, "Image", "Image", NA, "Image", "Image", "Engagement", "Education", "Education", "Education", NA)

wv_word_pair <- pairing(wv_word_dictionary, wv_word_category)

print(wv_word_pair)

wv_text <- wv_text %>%
  mutate(category = sapply(text, classify_text, word_pair = wv_word_pair))

print(wv_text)

yale

yale_text <- subset(data_posts_content, id == "yale.csv")
yale_corpus <- corpus_maker(yale_text)

yale_clean_text <- cleanup(yale_corpus, c("new", "—", "will", "can", "'", "first", "work", "read", "help", "year"))
Warning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documentsWarning: transformation drops documents
yale_word_dictionary <- freq_terms(yale_clean_text, 70)

yale_word_category <- c("Research", "Education", "Education", NA, "Research", "Research", "Research", "Research", "Education", "Image", "Research", "Education", "Image", "Research", NA, "Research", "Image", "Image", "Research", "Image", "Research", "Society", "Research", "Society", "Society")

yale_word_pair <- pairing(yale_word_dictionary, yale_word_category)

print(yale_word_pair)

yale_text <- yale_text %>%
  mutate(category = sapply(text, classify_text, word_pair = yale_word_pair))

print(yale_text)
---
title: "Project"
output: html_notebook
---
### For R beginners
New chunk *Ctrl+Alt+I*

Execute chunk *Ctrl+Shift+Enter*

Execute all chunks *Ctrl+Alt+R*

HTML preview *Ctrl+Shift+K*

# Library preparations

```{r}
library(readr)
library(dplyr)
library(tidyverse)
library(ggplot2)
library(reshape2)
library(stats)
library(tm)
library(text2vec)
library(textstem)
```

# Data Import

```{r}
data_posts <- read.csv("~/4year/2semester/dtII/CSVs/HEIs.csv",
                 colClasses = c(tweet_id = "character"))

# Modifying created_at type so that attribute can be used more easily 
data_posts$created_at <- as.POSIXct(data_posts$created_at,
                              format= "%Y-%m-%dT%H:%M:%S", tz="UTC")

#View(data)
summary(data_posts)
```

# Initial Data Preparation

```{r}
# Count of how many entries each HEI has
number_posts <- data_posts %>%
              group_by(id) %>% summarise(count = n())

number_posts
```

# Since complutense only has 1 entry we can't learn anything from it, so we removed it

```{r}
data_posts <- data_posts[data_posts$id != "complutense.csv", ]
```

# Visualization of all posts, just tweets and just replies

```{r}
number_posts <- data_posts %>%
              group_by(id) %>% summarise(posts = n())

number_tweets <- data_posts[data_posts$type == "Tweet", ] %>%
              group_by(id) %>% summarise(tweets = n())

number_replies <- data_posts[data_posts$type == "Reply", ] %>%
              group_by(id) %>% summarise(replies = n())

print(number_posts)
print(number_tweets)
print(number_replies)
```

# Calculating the percentage of tweets and replies based on all posts

```{r}
# Merging the counts of tweets and replies with the count of posts
data_ratio <- merge(number_posts, number_tweets, by = "id", all = TRUE)
data_ratio <- merge(data_ratio, number_replies, by = "id", all = TRUE)


data_ratio$percentage_tweets <- round(((data_ratio$tweets / data_ratio$posts) * 100), 2)
data_ratio$percentage_replies <- round(((data_ratio$replies / data_ratio$posts) * 100), 2)

data_ratio <- data_ratio[, c("id", "percentage_tweets", "percentage_replies")]

data_ratio$percentage_replies[is.na(data_ratio$percentage_replies)] <- 0

print(data_ratio)
```

# NA removal

# Function to visualize the number of NAs in all columns

```{r}
na_count <- function(){
  # Counting the number of NA values for each column
  na_count <- colSums(is.na(data_posts))
  
  # Creating a new data frame with the NA counts
  na_counts_table <- data.frame(Column = names(na_count), NA_Count = na_count)
  
  print(na_counts_table)
}
```

# Calculations of view, favourite, retweet and reply percentiles and visualization of NAs in all columns

```{r}
data_posts <- data_posts %>%
  group_by(id) %>%
  mutate(view_percentile = ntile(view_count, 100),
         favorite_percentile = ntile(favorite_count, 100),
         retweet_percentile = ntile(retweet_count, 100),
         reply_percentile = ntile(reply_count, 100)) %>%
  rowwise() %>%
  mutate(avg_percentile = round(mean(c(view_percentile, favorite_percentile, retweet_percentile, reply_percentile), na.rm = TRUE), 2))

na_count()

data_percentile <- data_posts[, c("id", "view_percentile", "favorite_percentile", "retweet_percentile", "reply_percentile", "avg_percentile")]

print(data_percentile)
```

# Calculation of the maximum number of views for each HEI

```{r}
max_view_counts <- tapply(data_posts$view_count, data_posts$id, max, na.rm = TRUE)

print(max_view_counts)
```

# Removal of NAs

```{r}
# From view count
data_posts$view_count <- ifelse(
  is.na(data_posts$view_count),
  round(max_view_counts[data_posts$id] * (data_posts$avg_percentile / 100)),
  data_posts$view_count)

# From view percentile
data_posts$view_percentile <- ifelse(
  is.na(data_posts$view_percentile),
  data_posts$avg_percentile,
  data_posts$view_percentile)
```

# Visualization of NAs in all columns

```{r}
na_count()
```

# Function to calculate average posts

```{r}
average_posts <- function(timeframe){
  # Calculation of the timeframe between earliest and latest post for each HEI
  date_range <- data_posts %>%
    group_by(id) %>%
    summarise(min_date = min(created_at),
              max_date = max(created_at)) %>%
    mutate(num_days = as.numeric(difftime(max_date, min_date, units = timeframe)))
  
  # Naming the column respecting the timeframe
  column_name <- paste0("avg_posts_per_", timeframe)
  
  # Calculation of the number of posts per day for each HEI
  posts_per_timeframe <- number_posts %>%
    left_join(date_range, by = "id") %>%
    mutate(!!column_name := round((posts / num_days), 2))
  
  print(posts_per_timeframe)
  return(posts_per_timeframe)
}
```

```{r}
posts_per_day <- average_posts("days")
posts_per_week <- average_posts("weeks")
```

# Plot for the average number of posts per day for each HEI

```{r}
barplot(posts_per_day$avg_posts_per_days,
        names.arg = posts_per_day$id,
        main = "Average Posts per Day",
        xlab = "HEI",
        ylab = "Average Number of Posts",
        ylim = c(0, max(posts_per_day$avg_posts_per_days) + 1),
        las = 2,
        col = "#3498DB")

# Adding text labels over each bar and aligning it with the center of each bar 
text(x = barplot(posts_per_day$avg_posts_per_days, plot = FALSE),
     y = posts_per_day$avg_posts_per_days,
     labels = round(posts_per_day$avg_posts_per_days, 2),
     pos = 3)
```

# Plot for the average number of posts per week for each HEI

```{r}
barplot(posts_per_week$avg_posts_per_weeks,
        names.arg = posts_per_week$id,
        main = "Average Posts per Week",
        xlab = "HEI",
        ylab = "Average Number of Posts",
        ylim = c(0, max(posts_per_week$avg_posts_per_weeks) + 5),
        las = 2,
        col = "#E74C3C")

text(x = barplot(posts_per_week$avg_posts_per_weeks, plot = FALSE),
     y = posts_per_week$avg_posts_per_weeks,
     labels = round(posts_per_week$avg_posts_per_weeks, 2),
     pos = 3)
```

# Defining the intervals of time for the academic year

```{r}
intervals <- list(
  interval1 = as.POSIXct(c("2022-08-31", "2022-12-15")),
  interval2 = as.POSIXct(c("2023-01-04", "2023-04-01")),
  interval3 = as.POSIXct(c("2023-04-14", "2023-06-15"))
)
```

# Function to check if a date falls within a given interval of time and apply appropriate Boolean

```{r}
check_interval <- function(date) {
  for (i in 1:length(intervals)) {
    interval_start <- intervals[[i]][1]
    interval_end <- intervals[[i]][2]
    if (date >= interval_start & date <= interval_end) {
      return(TRUE)
    }
  }
  return(FALSE)
}
```

```{r}
data_posts$academic_year <- sapply(data_posts$created_at, check_interval)
print(data.frame(id = data_posts$id, academic_year = data_posts$academic_year))
```

# Function to count number of posts and average per day during academic time and vacation time

```{r}
analyze_posts <- function(academic_year_filter) {
  # Filtering the data based on the academic_year_filter
  filtered_data <- data_posts %>%
    filter(academic_year == academic_year_filter)
  
  # Count of days for each HEI
  unique_days <- filtered_data %>%
    group_by(id) %>%
    summarise(unique_days = n_distinct(as.Date(created_at)))
  
  # Count of posts for each HEI
  number_posts_boolean <- filtered_data %>%
    group_by(id) %>%
    summarise(count = n())
  
  # Naming the column respecting the time period
  time <- ifelse(academic_year_filter, "academic_time", "vacation_time")
  column_name <- paste0("avg_posts_in_", time)
  
  # Combination of data and calculation of average posts per day
  combined_data <- left_join(unique_days, number_posts_boolean, by = "id")
  combined_data <- combined_data %>%
    mutate(!!column_name := round((count / unique_days), 2))
  
  print(combined_data)
  return(combined_data)
}
```

```{r}
data_posts_academic <- analyze_posts(TRUE)
data_posts_vacations <- analyze_posts(FALSE)
```

# Plot for the average number of posts during academic time for each HEI

```{r}
barplot(data_posts_academic$avg_posts_in_academic_time,
        names.arg = data_posts_academic$id,
        main = "Average Posts during Academic Time",
        xlab = "HEI",
        ylab = "Average Number of Posts",
        ylim = c(0, max(data_posts_academic$avg_posts_in_academic_time) + 5),
        las = 2,
        col = "#34495E")

text(x = barplot(data_posts_academic$avg_posts_in_academic_time, plot = FALSE),
     y = data_posts_academic$avg_posts_in_academic_time,
     labels = round(data_posts_academic$avg_posts_in_academic_time, 2),
     pos = 3)
```

# Plot for the average number of posts during vacation time for each HEI

```{r}
barplot(data_posts_vacations$avg_posts_in_vacation_time,
        names.arg = data_posts_vacations$id,
        main = "Average Posts during Vacation Time",
        xlab = "HEI",
        ylab = "Average Number of Posts",
        ylim = c(0, max(data_posts_vacations$avg_posts_in_vacation_time) + 5),
        las = 2,
        col = "#D35400")

text(x = barplot(data_posts_vacations$avg_posts_in_vacation_time, plot = FALSE),
     y = data_posts_vacations$avg_posts_in_vacation_time,
     labels = round(data_posts_vacations$avg_posts_in_vacation_time, 2),
     pos = 3)
```

# Data preparation for dates 

```{r}
# Creating new table that contains a new column for the day of the week
data_posts_days <- data_posts %>%
  mutate(day_of_week = weekdays(created_at))

# Selecting only the id, created_at, and day_of_week columns for the new table
data_posts_days <- data_posts_days %>%
  select(id, created_at, day_of_week)

# Create column hour from created_at
data_posts_days$created_hour <- as.numeric(format(data_posts_days$created_at, "%H"))

print(data_posts_days)
```

```{r}
# Grouping by id and day_of_week, then counting the number of posts
number_posts_days <- data_posts_days %>%
  group_by(id, day_of_week) %>%
  summarise(count = n())

# Grouping by id, day_of_week and day created at, then counting th enumber of tweets
number_posts_per_day <- data_posts_days %>%
    mutate(created_date = as.Date(created_at)) %>% 
    group_by(id, day_of_week, created_date) %>%
    summarize(count = n())

# Finding for each HEI the average count of posts per day
average_number_posts_per_day <- number_posts_per_day %>%
  group_by(id, day_of_week) %>%
  summarise(average_count = round(mean(count), 2))

print(number_posts_days)
```

# Highest and lowest posts

```{r}
# Finding the HEI with the lowest count of posts per day
lowest_count <- number_posts_days %>%
  group_by(day_of_week) %>%
  slice_min(order_by = count) %>%
  select(day_of_week, id, count)

# Finding the HEI with the highest count of posts per day
highest_count <- number_posts_days %>%
  group_by(day_of_week) %>%
  slice_max(order_by = count) %>%
  select(day_of_week, id, count)

# Combine the results
high_low_HEI <- bind_rows(lowest_count, highest_count) %>%
  arrange(day_of_week)

print(high_low_HEI)
```

# Plot for the highest and lowest count of posts per day for each day of the week

```{r}
ggplot(high_low_HEI, aes(x = day_of_week, y = count, fill = id)) +
  geom_bar(stat = "identity", position = "dodge") +
  geom_text(aes(label = count),
            position = position_dodge(width = 0.9),
            vjust = -0.5,
            size = 3) +
  labs(title = "Highest and Lowest Count of Posts per Day for Each Day of the Week",
       x = "Day of the Week", y = "Count") +
  scale_fill_manual(values = rainbow(length(unique(high_low_HEI$id)))) +
  theme_minimal() +
  theme(legend.title = element_blank())
```

# Average of posts

```{r}
# Finding the HEI with lowest and highest averaged count of posts per day
high_low_average_HEIs <- average_number_posts_per_day %>%
  group_by(day_of_week) %>%
  filter(average_count == max(average_count) | average_count == min(average_count)) %>%
  arrange(day_of_week, ifelse(average_count == min(average_count), average_count, -average_count))

print(high_low_average_HEIs)
```

# Plot for the highest and lowest average count of posts per day for each day of the week

```{r}
ggplot(high_low_average_HEIs, aes(x = day_of_week, y = average_count, fill = id)) +
  geom_bar(stat = "identity", position = "dodge") +
  geom_text(aes(label = round(average_count, 2)),
            position = position_dodge(width = 0.7),
            vjust = -0.5,
            size = 3) +
  labs(title = "Highest and Lowest Average Count of Posts per Day for Each Day of the Week",
       x = "Day of the Week", y = "Average Count") +
  scale_fill_manual(values = rainbow(length(unique(high_low_HEI$id)))) +
  theme_minimal() +
  theme(legend.title = element_blank())
```

# Favourite hour and day

```{r}
favourite_day_hei <- number_posts_days %>%
  group_by(id) %>%
  top_n(1, count) %>%
  arrange(id)

print(favourite_day_hei)
```

```{r}
number_posts_hours <- data_posts_days %>%
  group_by(id, created_hour) %>%
  summarise(count = n()) %>%
  ungroup()

favourite_hour_hei <- number_posts_hours %>%
  group_by(id) %>%
  top_n(1, count) %>%
  arrange(id)

print(favourite_hour_hei)
```

# Heatmaps

# Function to plot heatmap for various HEIs

```{r}
heatmap_maker <- function(target_id){
  # Filtering data for the specific HEI
  target_data <- data_posts_days %>%
    filter(id == target_id)
  
  # Grouping by day of the week and hour, and counting the number of tweets
  tweet_counts <- target_data %>%
    group_by(day_of_week, created_hour) %>%
    summarise(num_posts = n())
  
  # Plotting heatmap
  ggplot(tweet_counts, aes(x = day_of_week, y = created_hour, fill = num_posts)) +
    geom_tile() +
    scale_fill_gradient(low = "white", high = "blue") +
    labs(title = paste("Post Heatmap for", target_id),
         x = "Day of the week",
         y = "Hour of the day")
}
```

# Plot of heatmap for each HEI

```{r}
heatmap_maker("duke.csv")
heatmap_maker("epfl.csv")
heatmap_maker("goe.csv")
heatmap_maker("harvard.csv")
heatmap_maker("leicester.csv")
heatmap_maker("manchester.csv")
heatmap_maker("mit.csv")
heatmap_maker("sb.csv")
heatmap_maker("stanford.csv")
heatmap_maker("trinity.csv")
heatmap_maker("wv.csv")
heatmap_maker("yale.csv")
```

# Hashtags

```{r}
# Transforming empty strings into NA
data_posts$hashtags[data_posts$hashtags == ""] <- NA

# Table with number of unique hashtags and percentage of usage
hashtags <- data_posts %>%
                group_by(id) %>%
                summarise(count = n(),
                          na = sum(is.na(hashtags)),
                          unique_hashtags = length(unique(hashtags)),
                          hashtag_percentage = round(((count - na) / count * 100), 2))

print(hashtags)
```

# Plot for the count of unique hashtags for each HEI

```{r}
barplot(hashtags$unique_hashtags,
        names.arg = hashtags$id,
        main = "Unique Hashtags for Each HEI",
        xlab = "HEI",
        ylab = "Count of Unique Hashtags",
        ylim = c(0, max(hashtags$unique_hashtags) + 50),
        las = 2,
        col= "#16A085")

text(x = barplot(hashtags$unique_hashtags, plot = FALSE),
     y = hashtags$unique_hashtags,
     labels = round(hashtags$unique_hashtags, 2),
     pos = 3)
```

# Plot for the usage of hashtag for each HEI

```{r}
barplot(hashtags$hashtag_percentage,
        names.arg = hashtags$id,
        main = "Hashtags Percentage for Each HEI",
        xlab = "HEI",
        ylab = "Hashtags Percentage",
        ylim = c(0, max(hashtags$hashtag_percentage) + 30),
        las = 2,
        col= "#F1C40F")

text(x = barplot(hashtags$hashtag_percentage, plot = FALSE),
     y = hashtags$hashtag_percentage,
     labels = round(hashtags$hashtag_percentage, 2),
     pos = 3)
```

# URL usage

```{r}
# Transforming empty strings into NA
data_posts$urls[data_posts$urls == ""] <- NA

# Table with number of post, number of NA and url percentage of usage
url_usage <- data_posts %>%
                group_by(id) %>%
                summarise(count = n(),
                          na = sum(is.na(urls)),
                          url_percentage = round(((count - na) / count * 100), 2))

print(url_usage)
```

# Plot for the usage of hashtag for each HEI

```{r}
barplot(url_usage$url_percentage,
        names.arg = url_usage$id,
        main = "Urls Percentage for Each HEI",
        xlab = "HEI",
        ylab = "Urls Percentage",
        ylim = c(0, max(url_usage$url_percentage) + 10),
        las = 2,
        col= "#8E44AD")

text(x = barplot(url_usage$url_percentage, plot = FALSE),
     y = url_usage$url_percentage,
     labels = round(url_usage$url_percentage, 2),
     pos = 3)
```

# Text

```{r}
data_posts_content <- data_posts %>%
            select(id, text)

# Counting number of words
data_posts_content <- data_posts_content %>%
  mutate(num_words = lengths(strsplit(text, "\\s+")))

# Grouping by HEI and calculate average, minimum, and maximum values of number of words
data_posts_content_metrics <- data_posts_content %>%
  group_by(id) %>%
  summarise(average_num_words = mean(num_words),
            min_num_words = min(num_words),
            max_num_words = max(num_words))
print(data_posts_content_metrics)
```

# Plot for the average, maximum and minimum values of words for each HEI

```{r}
ggplot(data_posts_content_metrics, aes(x = id, y = average_num_words)) +
  geom_point(aes(color = "Average")) +
  geom_errorbar(aes(ymin = min_num_words, ymax = max_num_words, color = "Range"), width = 0.2) +
  scale_color_manual(values = c("Average" = "#1976D2", "Range" = "#EF5350")) +
  labs(title = "Word Count Summary by HEI",
       x = "HEI",
       y = "Number of Words",
       color = "Metric") +
  theme_minimal() +
  theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust = 1))
```

# Clusters

```{r}
# Creating table for cluster algorithms

# Joining attribute percentage_tweets (percentage of tweets out of all posts) and percentage_replies (percentage of replies out of all posts) from number_posts also adding unique_hashtags (number of unique hashtags) and hashtag_percentage (percentage of posts that contain a hashtag) from hashtags, per HEI
cluster_table <- merge(select(hashtags, id, unique_hashtags, hashtag_percentage), select(data_ratio, id, percentage_tweets, percentage_replies), by = "id", all=TRUE)

# Joining attribute avg_posts_per_days (average of posts per day) from posts_per_day per HEI
cluster_table <- merge(cluster_table, select(posts_per_day, id, avg_posts_per_days), by = "id", all=TRUE)

# Joining attribute avg_posts_per_weeks (average of posts per week) from posts_per_week per HEI
cluster_table <- merge(cluster_table, select(posts_per_week, id, avg_posts_per_weeks), by = "id", all=TRUE)

# Joining attribute avg_posts_in_academic_time (average of posts during academic time)  from data_posts_academic per HEI
cluster_table <- merge(cluster_table, select(data_posts_academic, id, avg_posts_in_academic_time), by = "id", all=TRUE)

# Joining attribute avg_posts_in_vacation_time (average of posts during vacation time) from data_posts_vacations per HEI
cluster_table <- merge(cluster_table, select(data_posts_vacations, id, avg_posts_in_vacation_time), by = "id", all=TRUE)

# Joining attribute created_hour (hour where every HEI made more posts) from favourite_hour_hei per HEI
cluster_table <- merge(cluster_table, select(favourite_hour_hei, id, created_hour), by = "id", all=TRUE)

# Joining attribute url_percentage (percentage of posts that contain an url) from url_usage per HEI
cluster_table <- merge(cluster_table, select(url_usage, id, url_percentage), by = "id", all=TRUE)

# Joining attribute average_num_words (average number of words in the posts) from data_posts_content_metrics per HEI
cluster_table <- merge(cluster_table, select(data_posts_content_metrics, id, average_num_words), by = "id", all=TRUE)

print(cluster_table)
```

# Function for cluster method

```{r}
cluster_maker <- function(num_clusters, table){
  # Excluding id column for clustering
  cluster_data <- select(table, -id)
    
  # Scaling the data for kmeans method
  scaled_data <- scale(cluster_data)
  
  kmeans_model <- kmeans(scaled_data, centers = num_clusters, nstart = 10)

  # Extract cluster assignments
  cluster_assignments <- kmeans_model$cluster
  
  # Create a data frame combining original data with cluster assignments
  clustered_data <- cbind(cluster_table$id, cluster_data, cluster = cluster_assignments)
  
  clustered_data <- clustered_data[, c("cluster_table$id", "cluster")]
  
  print(clustered_data)
}
```

# Function to discover best number of clusters

```{r}
elbow_maker <- function(table){
  cluster_data <- select(table, -id)
  scaled_data <- scale(cluster_data)
  
  wss <- vector()
  range <- 1:10
  
  for (k in range) {
    kmeans_model <- kmeans(scaled_data, centers = k, nstart = 10)
    wss[k] <- kmeans_model$tot.withinss
  }
  
  elbow_df <- data.frame(k = range, WSS = wss)
  ggplot(elbow_df, aes(x = k, y = WSS)) +
    geom_line() +
    geom_point() +
    labs(x = "Number of Clusters", y = "Within-Cluster Sum of Squares (WCSS)",
         title = "Elbow Method for Optimal k") +
    theme_minimal()
}
```

# 

```{r}
elbow_maker(cluster_table)
cluster_maker(3, cluster_table)
```

# 2 Parte


```{r}
cleanup <- function(docs, spec.words=NULL){
  # lowercase
  docs <- tm_map(docs, content_transformer(tolower))
  # rm numbers
  docs <- tm_map(docs, removeNumbers)
  # rm english common stopWords
  docs <- tm_map(docs, removeWords, stopwords("english"))
  # if stopwords are specified as a character vector
  if(!is.null(spec.words))
    docs <- tm_map(docs, removeWords, spec.words)
  # rm punctuations
  docs <- tm_map(docs, removePunctuation)
  # rm extra white spaces
  docs <- tm_map(docs, stripWhitespace)
  # lemmatizing text
  docs <- tm_map(docs, lemmatize_words)
  
  docs
}
```

```{r}
pairing <- function(word_dict, paired_words) {
  if (nrow(word_dict) != length(paired_words)) {
    stop("The number of rows in word_dict and the length of paired_words should be equal.")
  }
  
  word_dict <- tibble::tibble(word = word_dict$value)
  result <- tibble::tibble(word = word_dict$word, category = paired_words)
  return(result)
}
```

```{r}
classify_text <- function(text, word_pair) {
  # Tokenizing the text and converting to lowercase
  words <- tolower(unlist(strsplit(text, "\\W+")))
  
  # Finding the frequent words in the text
  freq_words <- words[words %in% word_pair$word]
  
  if (length(freq_words) == 0) {
    return("Unknown")  # Returning Unknown if no frequent words are found
  }
  
  # Getting the corresponding categories
  categories <- word_pair$category[word_pair$word %in% freq_words]
  
  # Sorting categories by frequency in descending order and return the most frequent one
  return(names(sort(table(categories), decreasing = TRUE))[1])
}
```

```{r}
corpus_maker <- function(text) {
  texts <- text$text
  vc <- VectorSource(texts)
  corpus <- Corpus(vc)
  
  return(corpus)
}
```

```{r}
freq_terms <- function(clean_text, number) {
  dtm <- DocumentTermMatrix(clean_text)
  dtm.tfidf <- weightTfIdf(dtm)
  
  mdf <- as_tibble(as.matrix(dtm.tfidf))
  
  mdf.freq <- mdf %>%
  select(findFreqTerms(dtm, number)) %>%
  summarise_all(sum) %>%
  gather() %>%
  arrange(desc(value))

  mdf.freq$key <- 
    factor(mdf.freq$key,
           levels = mdf.freq$key[order(mdf.freq$value)])
  
  word_dictionary <- as_tibble(mdf.freq$key)
  
  ggplot(mdf.freq, aes(x=key, y=value)) +
    geom_bar(stat="identity") +
    labs(x="terms", y="freq") + coord_flip()
  
  return(word_dictionary)
}
```

# Duke analysis

```{r}
duke_text <- subset(data_posts_content, id == "duke.csv")
duke_corpus <- corpus_maker(duke_text)

duke_clean_text <-cleanup(duke_corpus, c("new", "will", "change", "north", "can", "first", "year", "carolina", "years", "summer", "meet", "one"))

duke_word_dictionary <- freq_terms(duke_clean_text, 30)

duke_word_category <- c("Image", "Education", "Education", "Image", "Image", "Research", "Research", "Image", "Image", "Engagement", "Research", "Research", "Image", "Education", "Education", "Society", "Education", "Engagement")

duke_word_pair <- pairing(duke_word_dictionary, duke_word_category)

print(duke_word_pair)

# Applying the classify_text function to each text
duke_text <- duke_text %>%
  mutate(category = sapply(text, classify_text, word_pair = duke_word_pair))

print(duke_text)
```

# epfl

```{r}
epfl_text <- subset(data_posts_content, id == "epfl.csv")
epfl_corpus <- corpus_maker(epfl_text)

epfl_clean_text <- cleanup(epfl_corpus, c("new", "amp", "can", "will", "one", "now", "–", "via", "portrait"))

epfl_word_dictionary <- freq_terms(epfl_clean_text, 30)

epfl_word_category <- c("Image", "Research", "Image", "Research", "Research", "Research", "Education", "Image", "Research", "Research", "Education", "Research", NA, "Education", "Education")

epfl_word_pair <- pairing(epfl_word_dictionary, epfl_word_category)

print(epfl_word_pair)

# Applying the classify_text function to each text
epfl_text <- epfl_text %>%
  mutate(category = sapply(text, classify_text, word_pair = epfl_word_pair))

print(epfl_text)
```

# goe

```{r}
goe_text <- subset(data_posts_content, id == "goe.csv")
goe_corpus <- corpus_maker(goe_text)

goe_clean_text <- cleanup(goe_corpus, c("can", "new", "amp", "will"))

goe_word_dictionary <- freq_terms(goe_clean_text, 15)

goe_word_category <- c("Research", "Research", "Image", "Education", "Engagement", "Image", "Engagement", "Education")

goe_word_pair <- pairing(goe_word_dictionary, goe_word_category)

print(goe_word_pair)

# Applying the classify_text function to each text
goe_text <- goe_text %>%
  mutate(category = sapply(text, classify_text, word_pair = goe_word_pair))

print(goe_text)
```

# harvard

```{r}
harvard_text <- subset(data_posts_content, id == "harvard.csv")
harvard_corpus <- corpus_maker(harvard_text)

harvard_clean_text <- cleanup(harvard_corpus, c("new", "can", "will", "summer", "year", "first", "may", "-", "recent", "years", "one", "said", "time", "many", "world", "change"))

harvard_word_dictionary <- freq_terms(harvard_clean_text, 50)

harvard_word_category <- c("Image", "Education", "Research", "Image", "Research", "Research", "Engagement", "Education", "Society", "Education", "Society", "Research", "Education", "Image", "Research", NA, "Research", "Education", "Education", NA, "Research", "Society", "Society", "Research", "Education")

harvard_word_pair <- pairing(harvard_word_dictionary, harvard_word_category)

print(harvard_word_pair)

harvard_text <- harvard_text %>%
  mutate(category = sapply(text, classify_text, word_pair = harvard_word_pair))

print(harvard_text)
```

# leicester

```{r}
leicester_text <- subset(data_posts_content, id == "leicester.csv")
leicester_corpus <- corpus_maker(leicester_text)

leicester_clean_text <- cleanup(leicester_corpus, c("👉", "day", "new", "clear", "year", "can", "will", "time", "space", "one", "first"))

leicester_word_dictionary <- freq_terms(leicester_clean_text, 60)

leicester_word_category <- c("Image", NA, "Image", "Engagement", "Society", "Education", "Education", "Research", "Engagement", "Engagement", "Image", "Engagement", "Education", "Engamement", "Engagement", "Education", "Image", "Engagement", "Education", NA, "Image")

leicester_word_pair <- pairing(leicester_word_dictionary, leicester_word_category)

print(leicester_word_pair)

leicester_text <- leicester_text %>%
  mutate(category = sapply(text, classify_text, word_pair = leicester_word_pair))

print(leicester_text)
```

# manchester

```{r}
manchester_text <- subset(data_posts_content, id == "manchester.csv")
manchester_corpus <- corpus_maker(manchester_text)

manchester_clean_text <- cleanup(manchester_corpus, c("👇", "can", "just", "will", "get", "well", "one", "help", "now", "new", "read", "congratulations"))

manchester_word_dictionary <- freq_terms(manchester_clean_text, 50)

manchester_word_category <- c(NA, "Image", "Engagement", "Image", "Education", "Education", "Engagement", "Image", "Education", "Society", "Research", "Research", "Education", "Education", "Education", "Engagement", "Research", "Education", "Research")

manchester_word_pair <- pairing(manchester_word_dictionary, manchester_word_category)

print(manchester_word_pair)

manchester_text <- manchester_text %>%
  mutate(category = sapply(text, classify_text, word_pair = manchester_word_pair))

print(manchester_text)
```

# mit

```{r}
mit_text <- subset(data_posts_content, id == "mit.csv")
mit_corpus <- corpus_maker(mit_text)

mit_clean_text <- cleanup(mit_corpus, c("new", "can", "says", "“", "’", "—", "", "may", "first", "will", "using", "way", "one", "science"))

mit_word_dictionary <- freq_terms(mit_clean_text, 40)

mit_word_category <- c("Image", "Research", NA, "Image", NA, "Education", "Research", NA, "Education", "Research", "Research", "Education", "Research", "Research", "Image", "Education", "Education", "Research", "Research", "Research", "Research", "Research", "Research", "Research", "Research", "Society")

mit_word_pair <- pairing(mit_word_dictionary, mit_word_category)

print(mit_word_pair)

mit_text <- mit_text %>%
  mutate(category = sapply(text, classify_text, word_pair = mit_word_pair))

print(mit_text)
```

# sb

```{r}
sb_text <- subset(data_posts_content, id == "sb.csv")
sb_corpus <- corpus_maker(sb_text)

sb_clean_text <- cleanup(sb_corpus, c("new", "—", "will", "week", "can", "amp", "via", "now", "future", "first"))

sb_word_dictionary <- freq_terms(sb_clean_text, 30)

sb_word_category <- c("Image", "Research", "Image", "Image", "Image", NA, "Research", "Image", "Image", "Research", "Education", "Image", "Education", "Image", "Education", "Image", "Society")

sb_word_pair <- pairing(sb_word_dictionary, sb_word_category)

print(sb_word_pair)

sb_text <- sb_text %>%
  mutate(category = sapply(text, classify_text, word_pair = sb_word_pair))

print(sb_text)
```

# stanford

```{r}
stanford_text <- subset(data_posts_content, id == "stanford.csv")
stanford_corpus <- corpus_maker(stanford_text)

stanford_clean_text <- cleanup(stanford_corpus, c("new", "will"))

stanford_word_dictionary <- freq_terms(stanford_clean_text, 25)

stanford_word_category <- c("Image", "Image", "Research", "Education", NA)

stanford_word_pair <- pairing(stanford_word_dictionary, stanford_word_category)

print(stanford_word_pair)

stanford_text <- stanford_text %>%
  mutate(category = sapply(text, classify_text, word_pair = stanford_word_pair))

print(stanford_text)
```

# trinity

```{r}
trinity_text <- subset(data_posts_content, id == "trinity.csv")
trinity_corpus <- corpus_maker(trinity_text)

trinity_clean_text <- cleanup(trinity_corpus, c("amp", "read", "new", "can", "will", "week", "work", "great", "day", "visit", "irish", "first", "led", "congratulations"))

trinity_word_dictionary <- freq_terms(trinity_clean_text, 40)

trinity_word_category <- c("Image", "Education", "Research", "Image", "Research", "Image", "Research", "Society", "Society", "Education", "Engagement", "Engagement", "Education", "Image", "Education", "Image", "Research")

trinity_word_pair <- pairing(trinity_word_dictionary, trinity_word_category)

print(trinity_word_pair)

trinity_text <- trinity_text %>%
  mutate(category = sapply(text, classify_text, word_pair = trinity_word_pair))

print(trinity_text)
```

# wv

```{r}
wv_text <- subset(data_posts_content, id == "wv.csv")
wv_corpus <- corpus_maker(wv_text)

wv_clean_text <- cleanup(wv_corpus, c("💛💙", "🙌", "👉", "happy", "day", "see", "week", "great", "can", "will", "well", "know", "new", "now", "get", "just"))

wv_word_dictionary <- freq_terms(wv_clean_text, 40)

wv_word_category <- c(NA, "Image", "Image", NA, "Image", "Image", "Engagement", "Education", "Education", "Education", NA)

wv_word_pair <- pairing(wv_word_dictionary, wv_word_category)

print(wv_word_pair)

wv_text <- wv_text %>%
  mutate(category = sapply(text, classify_text, word_pair = wv_word_pair))

print(wv_text)
```

# yale

```{r}
yale_text <- subset(data_posts_content, id == "yale.csv")
yale_corpus <- corpus_maker(yale_text)

yale_clean_text <- cleanup(yale_corpus, c("new", "—", "will", "can", "'", "first", "work", "read", "help", "year"))

yale_word_dictionary <- freq_terms(yale_clean_text, 70)

yale_word_category <- c("Research", "Education", "Education", NA, "Research", "Research", "Research", "Research", "Education", "Image", "Research", "Education", "Image", "Research", NA, "Research", "Image", "Image", "Research", "Image", "Research", "Society", "Research", "Society", "Society")

yale_word_pair <- pairing(yale_word_dictionary, yale_word_category)

print(yale_word_pair)

yale_text <- yale_text %>%
  mutate(category = sapply(text, classify_text, word_pair = yale_word_pair))

print(yale_text)
```

